\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Leaks \label{leaks}}
\begin{tabular}{l*{5}{c}}
\hline\hline
                &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}\\
                &\multicolumn{1}{c}{sum\_leaks\_notEU}&\multicolumn{1}{c}{sum\_leaks\_notEU}&\multicolumn{1}{c}{sum\_leaks\_notEU}&\multicolumn{1}{c}{response residual}&\multicolumn{1}{c}{working residual}\\
                &     b/se         &     b/se         &     b/se         &     b/se         &     b/se         \\
\hline
main            &                  &                  &                  &                  &                  \\
Mean Right-Left &     0.03         &    -0.01         &     0.41\sym{***}&                  &                  \\
                &   (0.16)         &   (0.16)         &   (0.15)         &                  &                  \\
Mean R-L Political Polarization&                  &     0.11         &    -0.17         &                  &                  \\
                &                  &   (0.11)         &   (0.20)         &                  &                  \\
B-spline on [1976m4,2015m12)&                  &                  &    -6.82         &                  &                  \\
                &                  &                  &  (34.87)         &                  &                  \\
B-spline on [1986m3,2025m11)&                  &                  &   -27.46\sym{**} &                  &                  \\
                &                  &                  &  (11.78)         &                  &                  \\
B-spline on [1996m2,2035m10)&                  &                  &   -23.35         &                  &                  \\
                &                  &                  &  (17.20)         &                  &                  \\
B-spline on [2006m1,2045m9)&                  &                  &     0.00         &                  &                  \\
                &                  &                  &      (.)         &                  &                  \\
Mean Right-Left (residuals)&                  &                  &                  &     0.02         &     0.26         \\
                &                  &                  &                  &   (0.03)         &   (0.16)         \\
Mean R-L Political Polarization (residuals)&                  &                  &                  &     0.02         &     0.11         \\
                &                  &                  &                  &   (0.02)         &   (0.11)         \\
Constant        &    -1.24\sym{***}&    -6.21         &    30.52\sym{*}  &    -0.02         &    -0.15         \\
                &   (0.41)         &   (4.90)         &  (18.35)         &   (0.05)         &   (0.24)         \\
\hline
N               &      117         &      117         &      117         &      117         &      117         \\
R-squared       &                  &                  &                  &     0.02         &     0.05         \\
\hline\hline
\multicolumn{6}{l}{\footnotesize \sym{*} \(p<0.10\), \sym{**} \(p<0.05\), \sym{***} \(p<0.01\)}\\
\end{tabular}
\end{table}
